Endocrine Glands (Class XI/XII)

Thyrocalcitonin acts mainly on bones causing inhibition of bone resorption in young ones.

Thyrocalcitonin is secreted by parafollicular cells of the thyroid gland.

Hashimoto's disease is an autoimmune disorder in which the thyroid gland is destroyed by autoimmunity.

T4 contains 65% iodine. It has the highest amount of iodine.

Grave's disease is caused due to hyper-secretion of thyroid.

Deficient TSH stimulation of thyroid by the pituitary gland results into secondary hypothyroidism.

TRH is produced by hypothalamus and it stimulates the release of TSH from the pituitary gland.

Parathormone maintains the required level of Ca in the blood.

Dietary supplement of Ca and vitamin D because parathormone maintains Ca and P within narrow range. Vitamin D increases the resorption of P

Chief or principal secrete parathormone. These cells are small and appear dark when loaded with parathyroid hormone, and clear when the hormone has been secreted, or in their resting state.

Pineal gland is also known as epiphysis cerebri.

Thymosin is the hormone of the thymus and it stimulates the development of disease-fighting T cells.

Thymus gland is located behind the sternum and between the lungs.

Hypothalamus secretes PRH.

Thymus is said to be responsible for myasthenia gravis. It is believed that the thymus gland may give incorrect instructions to developing immune cells, ultimately resulting in autoimmunity and the production of the acetylcholine receptor antibodies, thereby setting the stage for the attack on neuromuscular transmission.